One-off payment = sole trader?

I was made redundant 31 March 2023 from my post as a charity CEO. In April I received a one-off payment from the charity to complete the wind-up tasks required to close the charity. I was NOT an employee and NOT taxed on this, I was simply the person with best skills/experience to do this. That was the only amount I 'earned' in 2023-24 tax year. Do I need to register as a sole trader so this single payment can be taxed correctly, or is there another way to declare it? I am already completing a SA form each year because I receive income from property. Thanks in advance :)

Hi,
If the payment was for self employment work, then yes, you will need to register as self employed and declare this on your Self Assessment return.
Thank you.